How to automatically update nginx upstream server list when aws ec2 hostname changes or increases?

by

This can be achieved by using Amazon SDK ( I am almost done with it, will put it on github ), utilizing the SNS, EC2 and Autoscaling service.

I have followed the below steps to achieve this:

  1. Enable HTTP notification and subscribed my webserver.
  2. Added a lifecycle-hook with heartbeat of 1 min (to wait for 1 min before terminating) to my autoscaling group for terminating server
  3. Created an index file to parse the message to detect what kind of message it is ( i.e Launch or Terminate)
  4. Once type of event is decided i queried EC2 to get the private ip of the instance
  5. In case of Launch wait till header 200 is recieved and then add the ip to nginx config and reload
  6. In case of Terminate remove the IP from config and reload nginx

Please find the script here https://github.com/singhupendra/aws-autoscale

Leave a Comment